106
D. Speed sensor
This check is carried out only if there are problems
with speed control or when the sensor/toothed gear has
been removed.
–
An oscilloscope is required to check the speed sen-
sor.
–
Connect the cables with blue and green contacts
from the test equipment to the oscilloscope. Start
the test bench and compare the read-offs with the
values given in the diesel test standards.
With different values, check the speed sensor pins
3–4 in the contact unit, check value 900–1100
ohms and the sensor setting with special tool
Bosch KDEP 1701. The sensor attachment mount-
ing has oval holes to allow for sensor position ad-
justment.
B. Check and setting fuel flows
Run the injection pump up to normal operating temper-
ature.
Note: With continuous driving at altitudes of 2000–
4000 metres above sea level, fuel flow must be reduced
by 10%. At 4000 metres and above 20%. Note that with
altered fuel flow, the engine data programmed into the
control unit when the engine was delivered from the
factory must be accordingly altered.
Contact unit on pump
Bosch
KDEP 1701
D. SPEED SENSOR (Control rod in stop position)
Pump speed:
60
r/min Positive amplitude
0.8–2.0
V (Setting value)
Positive amplitude
0.6–3.0
V (Control value)
Pump speed
600
r/min Difference in ampl.
1.4
V
B. CHECKING AND SETTING FUEL FLOWS
Test
no.
Pump
speed
Total
strokes
Control rod voltage
Delivery
flow
Difference
max.
Pump
check
values
Pump
setting
values
